if (document.images) {
	idx1on = new Image();
	idx1on.src = "image/index_footer_btn01on.gif";
	idx1off = new Image();
	idx1off.src = "image/index_footer_btn01.gif";
	idx2on = new Image();
	idx2on.src = "image/index_footer_btn02on.gif";
	idx2off = new Image();
	idx2off.src = "image/index_footer_btn02.gif";
	idx3on = new Image();
	idx3on.src = "image/index_footer_btn03on.gif";
	idx3off = new Image();
	idx3off.src = "image/index_footer_btn03.gif";
	idx4on = new Image();
	idx4on.src = "image/index_footer_btn04on.gif";
	idx4off = new Image();
	idx4off.src = "image/index_footer_btn04.gif";
	idx5on = new Image();
	idx5on.src = "image/index_footer_btn05on.gif";
	idx5off = new Image();
	idx5off.src = "image/index_footer_btn05.gif";
	idx6on = new Image();
	idx6on.src = "image/index_footer_btn06on.gif";
	idx6off = new Image();
	idx6off.src = "image/index_footer_btn06.gif";	
	idx7on = new Image();
	idx7on.src = "image/index_footer_btn07on.gif";
	idx7off = new Image();
	idx7off.src = "image/index_footer_btn07.gif";	
}
function imgOn(imgName) {
	if (document.images) {
		document[imgName].src=eval(imgName+"on.src");
	}
}
function imgOff(imgName) {
	if (document.images) {
		document[imgName].src=eval(imgName+"off.src");
	}
}